In my inbox it states "You have 7 confirmed and 0 unconfirmed private message receipts." (that number has been slowly growing over the past few years). Clicking that link takes me to http://www.flyertalk.com/forum/private.php?do=trackpm where it states:
"You do not have permission to access this page. This could be due to one of several reasons:"
On that page are two links, log out and home. I haven't tried the logout button, but the home button is 404 compliant, leading to this page not found:

In my inbox it states "You have 7 confirmed and 0 unconfirmed private message receipts." (that number has been slowly growing over the past few years). Clicking that link takes me to http://www.flyertalk.com/forum/private.php?do=trackpm where it states:
"You do not have permission to access this page. This could be due to one of several reasons:"
On that page are two links, log out and home. I haven't tried the logout button, but the home button is 404 compliant, leading to this page not found:

I think the PM Receipt/Track System had been turned off for us non-MOD sometimes in 2005 (?):